/Engine/Plugins/Runtime/nDisplay/Source/DisplayCluster/Public/Render/Projection/IDisplayClusterProjectionPolicy.h
Get the distance from the eye to the viewpoint location
virtual bool GetStereoEyeOffsetDistance ( [IDisplayClusterViewport](API\Plugins\DisplayCluster\Render\Viewport\IDisplayClusterViewport) * InViewport, const uint32 InContextNum, float & InOutStereoEyeOffsetDistance )